Coil bar anchor

ABSTRACT

A coil bar anchor for embedding into concrete structures has a threaded segment utilizing a coil thread and an anchor segment, the entire coil bar anchor being formed out of a single piece of material.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates generally to construction materials andmethods. More particularly, this invention relates to coil anchors foruse for lifting and positioning structural materials such as concretebarriers and other heavy and/or cumbersome devices. This inventionfurther relates to a method for manufacturing such a coil anchor.

2. Prior Art

Concrete structures, such as prefabricated barriers or panels, areubiquitous in the construction industry. As these structures are veryheavy, they often must be transported, lifted and positioned through theuse of heavy equipment such as a crane. In order to facilitate thetransporting, lifting and positioning of such structures, liftingassists and anchors, such as coil anchors, are installed in the concretestructures so as to provide a means to grasp and lift such structures.Typically, the anchors and other lifting assists are embedded into suchstructures and lifting attachments, such as lifting loops or liftingmembers, are attached to the anchor or other lifting assist. Often, theanchors and other lifting assists must be positioned within suchstructures the lifting attachment may be installed onto the anchor afterthe structure or panel has been formed or cut to the proper length orsize.

The lifting attachments, once attached to the anchor or other liftingassist, are used to lift and position the structure into place. In manyinstances, the lifting attachments often are releasably attached to thestructure and often removed once the structure has been position asdesired on site. More particularly, the lifting attachments, such aslifting rings and bolts, are installed and removed at the building site,and therefore preferably are designed to be easily and rapidly installedand removed in order to save the maximum amount of time. Notsurprisingly, the prior discloses devices placed within concretestructures that allow for the attachment of lifting attachments.

U.S. Pat. No. 4,655,015 to Hoyer discloses an anchor tie device for theconstruction industry that is in common use. The Hoyer '015 device is ananchor tie for use in carrying prefabricated concrete components and hasa threaded part for connecting the tie member to a lifting device and atie rod member that is secured within the prefabricated concretecomponent. The tie rod has two end portions such that the first end issecured to the threaded part and the second end is shaped so as to format least one undulation. The threaded part and the tie rod are securedtogether by means of radial pressure swaging.

Although the Hoyer '951 device is suitable for many applications, theuse of a swaging attachment technique has drawbacks. The two piecestructure defines a relatively weak point in the anchor tie,particularly at the junction between the threaded part and the tie rodpart. Often the weak point will be the first break or separate duringmovement and transport of the structure.

Further, current coil anchors in the US comprise a coiled wire with awelded strut. Such a coil anchor is shown in FIG. 1. This devicecomprises a “U”-shaped wire strut welded to a coiled wire and is formedinto the concrete structure with the opening of the coiled wire (the topof FIG. 1) even or close to even with the surface of the concretestructure, with the bulk of the device within the concrete structure. Acoil bolt then can be screwed into the opening of the coiled wire tolift the concrete structure. This type of coil anchor has a weak pointat the weld between the strut and the coiled wire, as would most if notall two-piece structures.

Accordingly, there is always need for an improved anchor for use in theconstruction industry. For example, there is a need for an improvedanchor having fewer or no weak points, or with weak points that arerelatively strong compared to prior art devices, and with a strongermeans for securing a lifting attachment within the anchor. Such animproved anchor should have a relatively simple structure and berelatively inexpensive to manufacture. Further, such an improved anchorshould be able to be embedded securely into concrete and other heavy orcumbersome structures such that the anchor may resist forces applied tothe anchor during lifting and positioning. It is to these needs, amongothers, that the present invention is directed.

BRIEF SUMMARY OF THE INVENTION

Briefly, the present invention is a coil bar anchor that is embeddedinto concrete and masonry structures, and the like, such as concretepanels and barriers to assist in the transporting, lifting andpositioning of such structures. For the purposes of this disclosure, allsuch structures will be referred to as concrete structures no matterwhat their material of manufacture. The coil bar anchor comprises a coilthread segment and an anchor segment (sometimes referred to as a tie rodor tie bar), which are formed as a unitary structure out of a singlepiece of material. The anchor segment comprises a shaped length ofmaterial and is secured within or to the concrete structure to securethe coil bar anchor to the concrete structure. The threaded segmentcomprises an interior coil thread accessible through an open top side. Alifting attachment is screwed into the threaded segment so that a craneor other lifting mechanism can lift, transport and/or position theconcrete structure.

The coil bar anchor is preferably manufactured from a high strengthmaterial such as iron or steel. The coil thread segment is comprised ofa spiral coil of material and the anchor segment is comprised of a rodof material that can be bent afterward to create a desired shape, ifdesired. Overall, the unitary coil anchor of the present invention hasan overall stronger structure than that of the two-piece anchors seen inthe prior art, utilizes a coil thread for added strength overconventional bolt threads, and can have a multi-dimensional anchorsegment design for added strength in being retained within the concretestructure.

More particularly, unlike the prior art, because the present inventionis formed from a single piece of material, the junction between thethreaded segment and the anchor segment is not a weak point relative tothe entire coil bar anchor. That is, because the coil bar anchor isformed as a unitary generally uniform uninterrupted structure, thejunction between the threaded segment and the anchor segment is strongerthan junction between the two separate sections of the prior art. Infact, it has been found that manufacturing the coil bar anchor from asingle piece of material results in a stronger coil anchor thanmanufacturing a coil anchor from two or more separate pieces.

In use and application, the coil bar anchor may be embedded or cast intoa concrete structure. In one embodiment, the coil bar anchor is placedinto the wet material (that is, the uncured concrete or other masonrymaterial, or other suitable materials such as epoxies, carbon fibermaterials, graphite fiber materials, ceramics, and the like) such that acast forms around at least the anchor segment and preferably also thethreaded segment with the top side of the threaded segment accessibleafterward. In another embodiment, a hole or slot is drilled into theconcrete structure, a construction epoxy is filled therein, and coil baranchor is inserted into the hole such that top side is accessibleafterward. In another embodiment, the coil bar anchor is positionedwithin a mold of a concrete structure and the concrete material ispoured into the mold such that the mold is filled and the wet materialforms a cast around the anchor shafts. After the material has set andcured, the coil bar anchor is secured within the concrete structure.

Another aspect of the invention is a method for manufacturing the coilbar anchor. Rather than swaging a coil threaded segment to a separateanchor segment as in the current art, the present invention is formedfrom a single piece of material. A coil thread can be formed into oneend of a rod having a suitable constant diameter, with the other end ofthe rod acting as the anchor segment. Alternatively, a rod having alarger diameter at one end can be used, with the coil thread beingformed into the end of the rod having the larger diameter.Alternatively, a coil bar anchor can be cast using a suitably shapedmulti-piece mold.

These features, and other features and advantages of the presentinvention, will become more apparent to those of ordinary skill in therelevant art when the following detailed description of the preferredembodiments is read in conjunction with the appended drawings in whichlike reference numerals represent like components throughout the severalviews.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a prior art coil anchor in common use.

FIG. 2 is a side view of one embodiment of the coil anchor of thepresent invention.

FIG. 3 is a sectional side view of the coil anchor shown in FIG. 2.

FIG. 4 is a side view in partial section of the coil anchor of thepresent invention embedded in a concrete structure and coupled to alifting attachment.

FIG. 5 is a side view in partial section of the coil anchor of thepresent invention embedded in a concrete structure and coupled to alifting attachment that shows in greater detail how the liftingattachment is attached to the threaded segment of coil anchor.

FIG. 6 is a cutaway side view showing the coil anchor of the presentinvention in a concrete structure held in place using an epoxy resin.

FIG. 7 shows alternative structures of the outer surface of the anchorsegment of the present invention, with FIG. 7A showing common raisedridges of rebar, FIG. 7B showing alternative protrusions, and FIG. 7Cshowing dimples.

FIG. 8 is a side view of an alternative structures for the anchorsegment of the present invention, with FIG. 8A showing a simpletwo-dimensional arc structure, FIG. 8B showing a more complextwo-dimensional wave structure, FIG. 8C showing a complexthree-dimensional helix structure, and FIG. 8D showing a straightstructure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Illustrative embodiments of the present invention include a coil baranchor to be embedded into concrete structures and structures of othermaterials, such as but not limited to concrete and cement barriers,concrete and cement panels, and prefabricated panels and barriers. Thecoil bar anchor of the present invention is useful particularly withconcrete structures that are lifted or positioned using mechanicalmeans. While the invention is described herein in conjunction with thepreferred and illustrative embodiments, it will be understood that theinvention is not limited to these embodiments.

Referring now to the figures in general, the figures illustratepreferred embodiments of the invention in the best mode known to theinventor at this time. Specifically, FIG. 2 is a side view of oneembodiment of the coil bar anchor 10 of the present inventionillustrating the unitary structure and the relationship between thethreaded segment 20 and the anchor segment 30. FIG. 3 is a sectionalside view of the coil bar anchor 10 shown in FIG. 2 illustrating how thecoil thread 22 is formed into the interior of the threaded segment 20.FIG. 4 is a side view in partial section of the coil bar anchor 10embedded in a concrete structure and coupled to a lifting attachment 40.FIG. 5 also is a side view in partial section of the embedded coil baranchor 10 and the lifting attachment 40 that shows in greater detail howthe lifting attachment 40 is attached to the threaded segment 20 of thecoil bar anchor 10. FIG. 6 is a cutaway side view showing the coil baranchor 10 in a concrete structure 100 held in place using an epoxy resin101. FIG. 7 shows alternative structures of the outer surface of theanchor segment 30. FIG. 8 shows alternative structures for the anchorsegment 30.

Referring now to FIG. 2, an embodiment of a coil bar anchor 10 inaccordance with this invention comprises a unitary device havingthreaded segment 20 at a first end and an anchor segment 30 at a secondend. In this embodiment, the threaded segment 20 is at one end of thecoil bar anchor 10 and provides a means to attach various liftingattachments 40 to the coil bar anchor 10 or to connect the coil baranchor 10 to a lifting device (not shown). The anchor segment 30, whichis shown having a wave shape 32, can extend from the threaded section 20and can provide a means to secure the coil bar anchor 10 in a concretestructure 100 (see FIG. 4). In the preferred embodiment, the coil baranchor 10 is formed or cast as a single structure.

Referring now to FIG. 3, the threaded segment 20 has internal threads 22that serve as a means for reversibly securing the coil bar anchor 10 tolifting attachments 40. More particularly, the threaded segment 20 iscapable of receiving the threaded stem 50 of a lifting attachment 40.The internal threads 22 preferably are of the conventional coil form andmay be of English or metric units. The coil threads provide a strongermeans for connecting the lifting attachment 40 to the coil bar anchor 10than conventional bolt threads. As it is important that the threadedsegment 20 connects the coil bar anchor 10 to the lifting attachment 40,the internal threads 22 should be large enough so that they are notstripped out by the lifting forces that may act thereon through liftingattachment 40.

Referring now to FIG. 4, the coil bar anchor 10 is shown placedpreferably into the concrete structure 100 such that the entire coil baranchor 10 is embedded within the concrete structure 100 and the top edge21 of the threaded segment 20 is flush with the surface 26 of theconcrete structure 100. The threaded segment 20 cooperates with the stem52 of each lifting attachment 40. More particularly, the stem 52comprises an external male thread that cooperates with the internalfemale thread of the treaded segment 20, and the stem 52 can be threadedinto the threaded segment 20.

The shape of the anchor segment 30 may be formed using a cold formingprocess, a casting process, or any other material forming processsuitable for the material of manufacture of the coil bar anchor 10. Sucha process is applied to produce a short arc or other disruption in thestraight portion of the anchor segment 30. More particularly, after apreliminary structure consisting essentially of the threaded segment 20and the anchor segment 30 has been formed as a single unitary structure,the arc shape 32 or any other desired disruption may be introduced intothe structure of the anchor segment 30. This arc shape 32 or otherdisruption serves to help retain the coil bar anchor 10 within theconcrete structure 100 better generally with higher strength than with astraight anchor segment 30. Thus, arc shape 32 can be anytwo-dimensional or three-dimensional disruption of the linear shape ofanchor segment 30.

Preferably, the coil bar anchor 10 is manufactured from a single,generally linear, piece of material, with the threaded segment 20 andthe anchor segment 30 being formed on opposite ends. In one embodiment,the anchor segment 30 may be formed initially as straight rod andsubsequently manipulated to a desired arc, wave, helix or other form. Ithas been found that manufacturing the coil bar anchor 10 from a singlepiece of material results in a stronger device than manufacturing a coilanchor from two or more separate pieces.

The anchor segment 30 assists in anchoring the coil bar anchor 10 withina concrete or other material structure, such as concrete structure 100,and typically has a length (measured axially) up to approximately 25inches or longer depending on the load of the concrete structure, andpreferably between 6 inches and 25 inches. The anchor segment 30typically has a diameter or thickness of up to 1.25 inches, andpreferably between 0.25 inch and 1.25 inches. Preferably, the threadedsegment 20 has a length of up to 6 inches, and more preferably between 1inches and 4 inches, and more preferably between 11 inch and 3 inches,with a diameter of between 0.75 inch and 3 inches, and more preferablybetween 0.75 inch and 2 inches. The length of the threaded segmentshould be on the order of twice the diameter or more of the threadedsegment. Preferably, the anchor segment 30 has a straightened length ofup to 25 inches, and is approximately straight for up to approximately 2to 6 inches extending from the threaded segment 20 and curved forapproximately 3 to 6 additional inches. The length, diameter orthickness, and curvature design of the anchor segment 30 can be selectedbased on the application and one of ordinary skill in the art can selectthe length, diameter or thickness, and curvature design of anchorsegment 30 without undue experimentation.

Referring now to FIG. 5, the lifting attachment 40 is attached to thethreaded segment 20 of the coil bar anchor 10. More particularly, thelifting attachment 40 may be attached to the embedded coil bar anchor 10by threading the male stem 50 of the lifting attachment 40 into thefemale internal threads 22 of the threaded segment 20. The pressureconnection in the threaded segment 20, that is the internal threads 22against the threads 52 of the lifting attachment 40, provides a means ofreversibly connecting the coil bar anchor 10 and the lifting attachment40. In such an embodiment, the lifting attachment 40 may be convenientlyconnected to the mechanical means, such as a crane.

In a preferred application, the coil bar anchor 10 is embedded into aconcrete structure 100. In one embodiment, both the threaded segment 20and the anchor segment 30 are embedded in the concrete structure 100 bycasting concrete structure 100 around the anchor bar coil 10 leaving theopen top end of the threaded segment exposed so as to be able to receivea lifting attachment. Preferably, the concrete structure 100 is moldedsuch that the threaded segment 20 and the anchor segment 30 areimmobilized in the concrete structure 100. For example, the concretematerial may be poured into a mold or frame so that the concretematerial flows around threaded segment 20 and the anchor segment 30 suchthat the top edge 21 of the threaded segment 20 is flush with thesurface of the concrete structure 100.

In this arrangement, the lifting attachment 40 may be attached to thethreaded segment 20. As shown in FIGS. 4 and 5, the lifting attachment40 is threaded into the threaded segment 20 so to provide effectiveresistance against pulling the lifting attachment 40 from the coil baranchor 10. Once the lifting attachment 40 is no longer needed, thelifting attachment 40 may be recovered and reused with another coil baranchor 10 or with the same coil bar anchor 10. Specifically, the liftingattachment 40 may be removed from the coil bar anchor 10 by rotating orunthreading the lifting attachment 40 from the coil bar anchor 10.

Referring now to FIG. 6, the coil bar anchor 10 is shown mounted in apre-formed slot in a concrete structure 100. Hole or slot 104 is drilledinto the concrete structure 100 (as mentioned previously, for ease ofunderstanding, all structures for which the coil bar anchor 10 can beused will be referred to as a concrete structure 100 irrespective of theactual material of manufacture), a construction epoxy 101 is filledtherein, and the coil bar anchor 10 is then inserted therein such thattop side of the threaded segment is accessible. This can be considered aretrofit application for the coil bar anchor 10. A slot 104 of a radius(or other shape depending on the shape of the coil bar anchor 10 or thetool used to create the slot 104) larger than of the anchor segment 30and wider than the cross section of the threaded segment 20 is drilledor otherwise formed into the concrete structure 100. After the debrisand any extraneous material are removed, an injection gun may be used toinject a construction epoxy 101 into the slot 104. Starting with theanchor segment, the anchor segment is inserted then into the slot 104such that the top side 21 of the thread segment 20 is flush with theouter surface of the concrete structure 100 and such that the internalthreads 22 are accessible. The construction epoxy 101 surrounds the coilbar anchor 10 (except for the top side 21) once the coil bar anchor 10is in place. After the construction epoxy 101 has set and cured, thecoil bar anchor 10 is secured in place within the concrete structure100. This method of installation provides a means for installing thecoil bar anchor 10 into concrete structure 100 that has previously set.

Referring now to FIG. 7, the anchorage of the coil anchor 10 within theconcrete structure 100 can be improved by introducing ribs 25 or othersurface features along the outer surface of anchor segment 30. FIGS. 7A,7B and 7C show alternative structures of the surface of the anchorsegment 20. FIG. 7A shows the common raised ridges 25 of rebar, FIG. 7Bshows alternative protrusions 24 and FIG. 7C shows dimples 26. In oneembodiment, the outer surface of the anchor segment 20 may have auniform pattern of the ribs 25. In another embodiment, the outer surfaceof the anchor segment 20 may have a pattern of protrusions 24 or dimples26. The use of ribs 25, protrusions 24 or dimples 26 provides additionalholding force for the anchor segment 30 within the concrete structure100. However, the invention also can be used with tie-rods that haverelatively smooth external surfaces or some other profile.

Referring now to FIG. 8, the anchor segment 30 can have a variety ofstructures. FIG. 8A shows the simple two-dimensional arc structure. FIG.8B shows a more complex two-dimensional wave structure. FIG. 8C shows acomplex three-dimensional helix structure. FIG. 8D shows a linear rodstructure, which is suitable for many situations. For most situations,the arc structure of FIG. 8A will be sufficient to maintain the coil baranchor 10 within the concrete structure 100. If added holding strengthis needed, that is, if the concrete structure 100 is heavier, the wavestructure of FIG. 8B or the helix structure of FIG. 8C may be requiredto maintain the coil bar anchor 10 within the concrete structure 100.Thus, the shape of the anchor segment 30 may be in one or more planes.

Another aspect of the invention is a method for manufacturing the coilbar anchor 10. The coil bar anchor 10 may be manufactured from asuitable metal or other material. For example, the coil bar anchor 10may be machined, molded or cast from an iron or steel bar stock. Thequality of steel suitable with the coil bar anchor 10 may be selectedaccording to the load bearing forces upon the coil bar anchor 10. One ofordinary skill in the art may select a suitable material without undueexperimentation. Rather than swaging a coil threaded segment 30 to aseparate anchor segment 20 as in the current art, the present inventionis formed from a single piece of material. A coil thread can 22 beformed into one end of a rod having a suitable constant diameter, withthe other end of the rod acting as the anchor segment 30. Alternatively,a rod having a larger diameter at one end can be used, with the coilthread 22 being formed into the end of the rod having the largerdiameter. Alternatively, a coil bar anchor 10 can be cast using asuitably shaped multi-piece mold.

The dimensions of the coil bar anchor 10 may be dependent on thedesigned load requirements of a particular application. However, thedimensions may depend on factors such as size of the mechanical liftingdevice, the size, weight and composition of the concrete structure 100,and the material selected for the coil bar anchor 10. One of ordinaryskill in the art may select appropriate dimensions for the coil baranchor 10 and components thereof.

In one embodiment, the internal threads 22 number at least eight turns;however, a greater or lesser number of internal threads 22 may benecessary to support larger concrete structures 100. It is contemplatedthat between four and twelve turns should be sufficient for the majorityof applications. It is necessary that the coil interior be free ofconcrete and has a sufficient number of turns to engage the threads 52of the lifting attachment 40 stem 50

As disclosed previously, in use and application, the coil bar anchor 10preferably is embedded or cast into a concrete structure 100. The coilbar anchor 10 may be used with or embedded in any concrete structure100. For example, such concrete structures 100 may include prefabricatedpanels or barriers and concrete blocks. Further, the coil bar anchor 10may be used with or embedded in prefabricated walls and constructionpanels. Concrete structures 100 suitable with this invention are obviousto those with ordinary skill in the art.

In one embodiment, the coil bar anchor 10 is placed into the wetmaterial (that is, the uncured concrete or other masonry material, orother suitable materials such as epoxies, carbon fiber materials,graphite fiber materials, ceramics, and the like) such that a cast formsaround the walls of the threaded segment 20 and the anchor segment 30.In another embodiment, a hole or slot 104 is drilled into the concretestructure 100 (as mentioned previously, for ease of understanding, allstructures for which the coil bar anchor 10 can be used will be referredto as a concrete structure 100 irrespective of the actual material ofmanufacture), a construction epoxy 101 is filled therein, and the coilbar anchor 10 is then inserted therein such that top side 21 of thethreaded segment 20 is accessible. In another embodiment, the coil baranchor 10 is positioned within a mold of a concrete structure 100 andthe concrete material is poured into the mold such that the mold isfilled and the wet material forms a cast around coil bar anchor 10 suchthat the top side 21 of the threaded segment 20 is accessible. After thematerial has set and cured, the coil bar anchor 10 is secured in placewithin the concrete structure 100.

One advantage of the coil bar anchor 10 is that the junction betweenthreaded segment 20 and the anchor segment 30 is stronger than that ofthe coil anchors of the prior art. As coil bar anchor 10 is formed as asingle structure, the junction between the threaded segment 20 and theanchor segment 30 is substantially stronger than that of priorinventions.

While the coil bar anchor 10 is disclosed in connection with the liftingattachment 40, it is understood that the coil bar anchor 10 may usedwith any fixture or object that may be connected the threaded segment20. For example, the coil bar anchor 10 could be used with bolts orother construction members. Such fixtures or objects that may be usedwith coil bar anchor 10 are readily known to those with ordinary skillin the art.

The above detailed description of the preferred embodiments, examples,and the appended figures are for illustrative purposes only and are notintended to limit the scope and spirit of the invention, and itsequivalents, as defined by the appended claims. One skilled in the artwill recognize that many variations can be made to the inventiondisclosed in this specification without departing from the scope andspirit of the invention.

1. A coil bar anchor consisting essentially of a single piece ofmaterial with: a) a threaded segment at a first end having a diameterand internal threads of a predetermined number; and b) an anchor segmentat a second end, wherein the coil bar anchor is manufactured as a singleunitary structure and the internal threads cooperate with the threads ona lifting attachment.
 2. The coil bar anchor as claimed in claim 1,wherein the threaded segment has a length measured axially of at leasttwice the thread diameter.
 3. The coil bar anchor as claimed in claim 2,wherein the threaded segment has a length between approximately 1 inchand 3 inches and a thread diameter of between 0.5 inch and 1.5 inches.4. The coil bar anchor as claimed in claim 2, wherein the anchor segmenthas a length of up to approximately 25 inches and a diameter of betweenapproximately 0.25 inch and 1.25 inches.
 5. The coil bar anchor asclaimed in claim 1, wherein the threaded segment is capable of receivinga lifting attachment.
 6. The coil bar anchor as claimed in claim 1,wherein the anchor segment has a linear shape.
 7. The coil bar anchor asclaimed in claim 1, wherein the anchor segment has a non-linear shape.8. The coil bar anchor as claimed in claim 7, wherein the non-linearshape is selected from the group consisting of arcs, waves, and helixes.9. The coil bar anchor as claimed in claim 1, wherein the anchor segmenthas protrusions on an outer surface thereof.
 10. The coil bar anchor asclaimed in claim 1, wherein the anchor segment has dimples on an outersurface thereof.
 11. The coil bar anchor as claimed in claim 1, where inthe internal threads are coil threads.
 12. The coil bar anchor asclaimed in claim 1, wherein the single piece of material is a metal rod,the threaded segment of the first end has an outer diameter of betweenapproximately 0.75 inch and approximately 2.0 inches, the threadedsegment of the first end has a length of between approximately 1.0 inchand approximately 4.0 inches, anchor segment of the the second end hasan outer diameter of between approximately 0.25 inch and approximately1.25 inches, and the anchor segment of the second end has a length of upto approximately 25 inches.
 13. In a coil bar anchor comprising athreaded segment and an anchor segment, the improvement comprisingmanufacturing the coil bar anchor out of a single piece of material andthe threaded segment having an internal coil thread for cooperating witha lifting attachment.
 14. The coil bar anchor as claimed in claim 13,wherein the single piece of material is a metal rod, the threadedsegment of the first end has an outer diameter of between approximately0.75 inch and approximately 2.0 inches, the threaded segment of thefirst end has a length of approximately twice the outer diameter, theanchor segment of the second end has a diameter of between approximately0.5 inch and 1.25 inches, and the anchor segment of the second end has alength of between approximately 5 inches and approximately 12 inches.15. The coil bar anchor as claimed in claim 14, wherein the anchorsegment has surface disruptions on an outer surface thereof.
 16. Thecoil bar anchor as claimed in claim 15, wherein the anchor segment has anon-linear shape.
 17. The coil bar anchor as claimed in claim 16,wherein the non-linear shape is selected from the group consisting ofarcs, waves, and helixes.
 18. The coil bar anchor as claimed in claim15, wherein the anchor segment has a linear shape.
 19. A method formanufacturing a coil bar anchor comprising the steps of: a) forming aninternal coil thread into a first end of a single piece of materialhaving a suitable thickness; and b) shaping a second end of the rod intoan anchor segment.
 20. The method for manufacturing a coil anchor asclaimed in claim 19, wherein the single piece of material is a metalrod, the first end has an outer diameter of between approximately 0.75inch and approximately 2.0 inches, the first end has a length of betweenapproximately 1.0 inch and approximately 4.0 inches, the second end hasa diameter of between approximately 0.25 inch and 1.25 inches, and thesecond end has a length of between approximately 5 inches andapproximately 25 inches.
 21. The method for manufacturing a coil baranchor as claimed in claim 20, wherein surface disruptions are formedonto an outer surface of the anchor segment.
 22. The method ofmanufacturing a coil bar anchor as claimed in claim 21, wherein theanchor segment is shaped into a non-linear shape.
 23. The method ofmanufacturing a coil bar anchor as claimed in claim 22, wherein thenon-linear shape is selected from the group consisting of arcs, waves,and helixes.
 24. The method of manufacturing a coil bar anchor asclaimed in claim 21, wherein the anchor segment is shaped into a linearshape.